5 star on my wish list too but I don't see how it would increase mileage and I'm sure it would void warranty if something was to go wrong with trans or engine. I know some say you can re install original tune but I have not seen this with my own eyes and makes me a little apprehensive to buy one. What if something did go wrong and you could not re install original tune? Really be up a "s" creek at that point. Maybe when mine is out of warranty, then.
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